<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>HTML5 调用手机摄像头</title>
  <style type="text/css">
  </style>
  <script>
    window.addEventListener("DOMContentLoaded", function() {
      var canvas = document.getElementById("canvas"),
        context = canvas.getContext("2d"),
        video = document.getElementById("video"),
        videoObj = { "video": true },
        errBack = function(error) {
          console.log("Video capture error: ", error.code);
        };


      if(navigator.getUserMedia) { // Standard
        navigator.getUserMedia(videoObj, function(stream) {
          video.src = stream;
          video.play();
        }, errBack);
      } else if(navigator.webkitGetUserMedia) { // WebKit-prefixed
        navigator.webkitGetUserMedia(videoObj, function(stream){
          video.src = window.webkitURL.createObjectURL(stream);
          video.play();
        }, errBack);
      }
      else if(navigator.mozGetUserMedia) { // Firefox-prefixed
        navigator.mozGetUserMedia(videoObj, function(stream){
          video.src = window.URL.createObjectURL(stream);
          video.play();
        }, errBack);
      }
// 拍照
      document.getElementById("snap").addEventListener("click", function() {
        context.drawImage(video, 0, 0, 640, 480);
      });
    }, false);


  </script>
</head>
<body>
<video id="video" width="640" height="480" autoplay></video>
<button id="snap" style="font-size: 40px;" >拍照</button>
<canvas id="canvas" width="640" height="640"></canvas>
</body>
</html>
